They have done a really good job, but they also have a lot of practice. lazy_daze and balefully also run the spn_j2_xmas exchange, as well as blindfold.

I've run one exchange and it turned out to be way more difficult and time-consuming than I had expected when I started it, so I have a lot of respect for their abilities. I made some rookie mistakes that I bet l_d and balefully would have handily avoided.